Screening apparatus



Oct. 20, 925.

H. P. HOYLE' scnnsmue APPARATUS Filed Dec. 18, 1923 4 Sheets-Sheet 1 H. P. HQYhE scnmmme APPARATUS Oct. 20

4 Sheets-Sheet .5

Filed Dec. 18. 1923 Oct. 20, 2 1,557,843

H. P. HOYLE SCREENING APPARATUS Filed Dec. 18. 1923 4 sheets-sheet- 4' Patented Oct. 20, 1325. v

UNITED STATES 1,557,843 PATENT OFFICE.

HENRY PATRICK HoYL'E, or DURHAM, ENGLAND.

SCREENING APPARATUS.

Application filed December 18, 1923. Serial No. 681,352.

To all whom it may concern-.-

Be it known that I, HENRY PATRICK Horne, a. subject of the King of Great Britain, residing at 46 North Bailey, Durham, England, have invented new and useful Improvements in Screening Apparatus, of which the following is a specification.

This invention relates to screening apparatus in which a vibratory motion is imparted to the screening surfaces.

According to the present invention. the

screening surface, or preferably two sc-reening surfaces arranged one. above the other, is or aresecured to side bars secured to supports having trunnions held in clamps secured to a fixed frame. The supports are connected together by a bar which passes over the top of the sieving surfaces and carries bearings for supporting a shaft which extends through a bearing-in the trunnions on the right hand side of the screen as shown in Figures 1 and 2.

On the shaft are eccentric portions set at an angle of 180 to each other, and a hollow sleeve is carried by bearings mounted on the eccentric portions, and to the bearings are attached arms, passing through' holes at the end of which are bolts which extend through the sieving surface or surfaces and bars connected to the same.

Springs are inserted between the underside of the arms and the bars, the tension of the springs being regulated by nuts screwing on to the bolts.

When two screening surfaces are employed, distance pieces are inserted between the surfaces.

The screening surfaces may be secured to the side bars by jaws held together by eye bolts and secured to the side bars by palm bolts.

The accompanying drawings illustrate apparatus made in accordance with this invention. u

Figurel is a longitudinal section, Figure 2 a plan, Figure 3 a transverse section, and Figure 4 a diagrammatic end view of a screening apparatus. Figures 5 and 6 show details to a larger scale. Figure 7 is a diagrammatic view of. the eccentric portions of the shaft.

The screening surfaces 10, superposed one above the other, are secured in clamps 11 at each side of the screen. Each screening surface 10 is held between two strips of india rubber 12 (see Figure 1) by the jaws of the clamps 11, the jaws being held together by pivoted bolts '13 and nuts 14. The clamps 11 aresecured to side bars 15 by palm bolts 16, the palms atone end of the bolt being secured to the clamps 11 by bolts 17 and at the other ends by nuts 13 to the side bars 15. Theside bars 15 are secured to supports 19 having trunnions 20 held in clamps 21 secured to the fixed frame 22 by bolts 23. The supports 19 are connected together by a bar 24 passing above the screening surfaces 10, and on the bar 24 are bearings 25 supporting a shaft 26 which extends through a bearing in the trunnion 20 on the right hand side of the screen as shown in Figures 1 and 2.

On the shaft 26 are eccentric portions 27, as is shown in Figure 6 and in the diagram Figure 7. A hollow sleeve 28 is carried by bearings 29 mounted perpendicularly to the common aXiS of the eccentric portions 27 ofthe shaft 26 and to each of said bearings 29 are secured arms 30. Rings 31 enclose the ends 'ofthe bearings 25 and 29, rubber rings v32 being inserted at the ends of the rings 31 (seeFigure 6). I

Preferably the axes of the eccentric portions 27 are in a line with each other and pass through the centre point 33 of the axis of the portion of the shaft 26 between the.

portions 27, as shown in the diagram Figure 7. When the shaft 26 is turned, the eccentric portions 27 cause the arms 30 to impart to the screening surfaces 10 an up and down movement combined with a crosswise movement. This twofold movement produces more effective screeningtha-n a single movement only, the maternal being continually separated-by the upward throw and compelled to take a longer or zig-zag path on its passage down thescreen, owing to the also pass through holes in bars 35 secured to the screening surfaces 10 by bolts and 'nuts 36. Springs 37 are inserted between the undersides of the arms 30 and the bars 35 on the upper screening surface, and the bolts 34 are held in position and the tension of the springs 37 also regulated by nuts 38 andv 39 at the ends of the bolts 34, and distance ieces 40 which surround-the bolts 34 are inserted between the two screening surfaces 10.

Referring more particularly to Figure 4, it will be seen that the coarser material runs off the upper screening surface 10 to a re ceptacle 41, whilst the intermediate product which passes through the upper screening surface and runs off the lower screening surface passes to av receptacle 42, the material ,center point of the axis of the portion of the shaft between the eccentrics which eccentrlcs give the 'arms and screening surface a movement to, fro and crosswise.

2. The combination of a screening surface with arms engaging the same, positive means located above the screening surface for giving the arms and screen surface an appreciable movement to and fro, and springs between the ends of the arms and screening surface.

3. The combination wlth a screening surface of' arms engaging the same, positive means located above the screening surface for givmg the arms and screenlng surface an appreciable movement to,.fro and crosswise, and springs between the ends of the arms and the screening surface. 4. The combination of a screening suring surface. 7. The combination of two superposed face with arms engaging the same, a shaft located above the screening surface, eccentrics on the shaft whicheccentrics give the arms and the screening surface a movement to and fro, and springs between the ends of the arms and the screening surface.

5. The combination with a screening surface of arms engaging the same, a shaft located above the screening surface, eccentrics on the shaft which eccentrics give the arms and screening surface a movement to, fro and crosswise, and springs between the ends of the arms and the screening surface.

6. The combination of a screening surface with arms engaging the same, ashaft located above the screening surface, eccentrics spaced apart on the shaft and formed with their axes in a line which passes through the center point of the'axis of the portion of the shaft between the eccentrics, and springs between the ends of the arms and the screenscreening surfaces, with arms engaging the 1 same, a shaft located above the screens, ec-

centrics on the shaft which'give the arms a movement to, fro and crosswise, and springs between the ends ofthe arms and the upper screening surface.

In testimony that I claim the foregoing as my invention I have signed my name this fifth day of December, 1923.

HENRY PATRICK HOYLE. 

